Android中Gallery和ImageSwitcher的使用实例_android教程

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Android中Gallery和ImageSwitcher的使用实例

发布时间：2019-08-08 发布网站：脚本宝典

脚本宝典收集整理的这篇文章主要介绍了Android中Gallery和ImageSwitcher的使用实例，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。

效果如下：

Android中Gallery和ImageSwitcher的使用实例

布局文件activITy_main.XMl如下：

 <RelativeLayout xMLns:andROId="http://schemas.android.COM/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:paddingBottom="@dimen/activity_vertical_margin"   android:paddingLeft="@dimen/activity_horizontal_margin"   android:paddingRight="@dimen/activity_horizontal_margin"   android:paddingTop="@dimen/activity_vertical_margin"   tools:context=".MainActivity" >   <ImageSwitcher     android:id="@+id/imageSwitcher"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_weight="2"     android:paddingTop="30px" >   </ImageSwitcher>   <Gallery     android:id="@+id/gallery1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_weight="1"     android:spacing="5px"     android:unselectedAlpha="0.6" /> </RelativeLayout>

MainActivity.java代码如下：

 import android.app.ActionBar.LayoutParams; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher.ViewFactory; public class MainActivity extends Activity {   PRivate int imageId[] = new int[] { R.drawable.a, R.drawable.b,       R.drawable.c, R.drawable.d, R.drawable.e, R.drawable.f,       R.drawable.g, R.drawable.h, R.drawable.i, R.drawable.j,       R.drawable.k };   private ImageSwitcher imageSwitcher;   private Gallery gallery;   @override   protected void onCreate(Bundle savedInstancestate) {     suPEr.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     imageSwitcher = (ImageSwitcher) this.findViewById(R.id.imageSwitcher);     gallery = (Gallery) this.findViewById(R.id.gallery1);     // 设置动画效果     imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,         android.R.anim.fade_in));     imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,         android.R.anim.fade_out));     imageSwitcher.setFactory(new ViewFactory() {       @Override       public View makeView() {         ImageView imageView = new ImageView(MainActivity.this);         imageView.setScaleType(ImageView.ScaleType.FIT_center); // 设置保持纵横比居中         imageView.setLayoutParams(new ImageSwitcher.LayoutParams(             LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));         return imageView;       }     });     GalleryAdapter adapter = new GalleryAdapter(MainActivity.this,imageId);     gallery.setAdapter(adapter);     gallery.setSelection(imageId.length / 2);     gallery.setOnItemSelectedListener(new OnItemSelectedListener() {       @Override       public void onItemSelected(AdapterView<&#63;> parent, View view,int position, long id) {         imageSwitcher.setImageResource(imageId[position]);       }       @Override       public void onNothingSelected(AdapterView<?> arg0) {       }     });   } }

其中需要的一个适配器：

 import android.content.Context; import android.content.res.TypedArray; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; public class GalleryAdapter extends BaseAdapter {   private int[] imageId;   private Context mContext;   /**    * 穿入上下文和图片资源数组    * @param mContext    * @param imageId    */   public GalleryAdapter(Context mContext, int[] imageId) {     this.mContext = mContext;     this.imageId = imageId;   }   @Override   public int getCount() {     return imageId.length;   }   @Override   public Object getItem(int position) {     return imageId[position];   }   @Override   public long getItemId(int position) {     return position;   }   @Override   public View getView(int position, View convertView, ViewGroup parent) {     ImageView imageView1;     if (convertView == null) {       imageView1 = new ImageView(mContext);       imageView1.setScaleType(ImageView.ScaleType.FIT_XY);       imageView1.setLayoutParams(new Gallery.LayoutParams(180, 135));       TypedArray typedArray = mContext           .oBTainStyledAttributes(R.styleable.Gallery);       imageView1.setBackgroundResource(typedArray.getResourceId(           R.styleable.Gallery_android_galleryItemBackground, 0));       imageView1.setPadding(5, 0, 5, 0); // 设置ImageView的内边距     } else {       imageView1 = (ImageView) convertView;     }     imageView1.setImageResource(imageId[position]); // 为ImageView设置要显示的图片     return imageView1; // 返回ImageView   } }

到此 OK！

总结

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